Skip to Main Content
Effects of augmentation of coarse particulate organic matter on metabolism and nutrient retention in hyporheic sedimentsAuthor(s): C.L. Crenshaw; H.M. Valett; J.R. Webster
Source: Freshwater Biology 47: 1820-1831
Publication Series: Miscellaneous Publication
PDF: View PDF (966 KB)
Description1. Metabolic and biogeochemical processes in hyporheic zones may depend on inputs of coarse particulate organic matter. Our research focused on how differing quantity and quality of organic matter affects metabolism and nutrient retention in the hyporheic zone of a first-order Appalachian stream. 2. Sixteen plots were established on a tributary of Hugh White Creek, NC, U.S.A. Sediment was extracted and treated with leaves, wood, plastic strips or remained unamended. Following treatment, sediment was retumed to the stream and, approximately 3 months later, samples were removed from each plot. 3. Aerobic and anaerobic metabolism were measured as the change in O2 and C02 in recirculating microcosms. At the same time, we monitored other possible terminal electron accepting processes and changes in nutrient concentrations. Aerobic metabolism was low in all treatments and respiratory quotients calculated for all treatments indicated that metabolism was dominated by anaerobic processes. 4. Rates of anaerobic respiration and total (combined aerobic and anaerobic) respiration were signrficantly greater (P < 0.05) in plots treated with leaf organic matter compared to controls. 5. Addition of leaves, which had a low C:N ratio, stimulated respiration in hyporheic sediments. Anaerobic processes dominated metabolism in both control and amended sediments. Enhanced metabolic rates increased retention of many solutes, indicating that energy flow and nutrient dynamics in the subsurface of streams may depend upon the quantity and quality of imported carbon.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationCrenshaw, C.L.; Valett, H.M.; Webster, J.R. 2002. Effects of augmentation of coarse particulate organic matter on metabolism and nutrient retention in hyporheic sediments. Freshwater Biology 47: 1820-1831
KeywordsAnaerobic contact information, CPOM, hyporheic, metabolism, nutrients
- Measuring aerobic respiration in stream ecosystems using the resazurin-resorufin system
- Biomass and decay rates of roots and detritus in sediments of intermittent coastal plain streams
- Influence of Channel Geomorphology on Retention of Dissolved and Particulate Matter in a Cascade Mountain Stream
XML: View XML